mirror of git://sourceware.org/git/glibc.git
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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/* POSIX.1 `sigaction' call for Linux/i386.
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Copyright (C) 1991, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <sysdep.h>
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#include <errno.h>
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#include <stddef.h>
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#include <signal.h>
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/* If ACT is not NULL, change the action for SIG to *ACT.
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If OACT is not NULL, put the old action for SIG in *OACT. */
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int
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__sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
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{
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struct sigaction newact;
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int result;
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if (new)
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{
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newact = *new;
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new = &newact;
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new->sa_restorer = ((new->sa_flags & SA_NOMASK)
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? &&restore_nomask : &&restore);
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}
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asm volatile ("pushl %%ebx\n"
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"movl %1, %%ebx\n"
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"int $0x80\n"
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"popl %%ebx"
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: "=a" (result)
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: "0" (SYS_ify (sigaction)), "g" (sig), "c" (new), "d" (old));
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if (result < 0)
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{
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errno = -result;
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return -1;
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}
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return 0;
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restore:
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asm (
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#ifdef PIC
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" pushl %ebx\n"
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" call 0f\n"
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"0: popl %ebx\n"
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" addl $_GLOBAL_OFFSET_TABLE_+[.-0b],%ebx\n"
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" addl $8, %%esp\n"
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" call __sigsetmask@PLT\n"
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" addl $8, %%esp\n"
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" popl %ebx\n"
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#else
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" addl $4, %%esp\n"
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" call __sigsetmask\n"
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" addl $4, %%esp\n"
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#endif
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"popl %eax\n"
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"popl %ecx\n"
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"popl %edx\n"
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"popf\n"
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"ret");
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restore_nomask:
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asm ("addl $4, %esp\n"
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"popl %eax\n"
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"popl %ecx\n"
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"popl %edx\n"
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"popf\n"
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"ret");
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}
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weak_alias (__sigaction, sigaction)
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